arch/sparc64/lib/NGcopy_to_user.S

   1 /* NGcopy_to_user.S: Niagara optimized copy to userspace.
   2  *
   3  * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #define EX_ST(x)                \
   7 98:     x;                      \
   8         .section .fixup;        \
   9         .align 4;               \
  10 99:     wr      %g0, ASI_AIUS, %asi;\
  11         ret;                    \
  12          restore %g0, 1, %o0;   \
  13         .section __ex_table,"a";\
  14         .align 4;               \
  15         .word 98b, 99b;         \
  16         .text;                  \
  17         .align 4;
  18
  19 #ifndef ASI_AIUS
  20 #define ASI_AIUS        0x11
  21 #endif
  22
  23 #define FUNC_NAME               NGcopy_to_user
  24 #define STORE(type,src,addr)    type##a src, [addr] ASI_AIUS
  25 #define STORE_ASI               ASI_BLK_INIT_QUAD_LDD_AIUS
  26 #define EX_RETVAL(x)            %g0
  27
  28 #ifdef __KERNEL__
  29         /* Writing to %asi is _expensive_ so we hardcode it.
  30          * Reading %asi to check for KERNEL_DS is comparatively
  31          * cheap.
  32          */
  33 #define PREAMBLE                                        \
  34         rd              %asi, %g1;                      \
  35         cmp             %g1, ASI_AIUS;                  \
  36         bne,pn          %icc, memcpy_user_stub;         \
  37          nop
  38 #endif
  39
  40 #include "NGmemcpy.S"